Determine the Integral by Making an Appropriate Substitution $\int x ^ { 2 } \sin \left( 7 x ^ { 3 } - 6 \right) d x$

Multiple Choice

Determine the integral by making an appropriate substitution.
- $\int x ^ { 2 } \sin \left( 7 x ^ { 3 } - 6 \right) d x$

A) 21 cos(7 $x ^ { 3 }$ - 6) + C
B) - $\frac { 1 } { 21 }$ cos(7 $x ^ { 3 }$ - 6) + C
C) $\frac { 1 } { 21 }$ cos(7 $x ^ { 3 }$ - 6) + C
D) -21 cos(7 $x ^ { 3 }$ - 6) + C